SA1 experienced very high renewable penetration of 97.8%, driven predominantly by wind generation of 1,847 MW with minimal thermal and battery contribution. Regional wholesale prices collapsed sharply, falling from ~$9.65/MWh to just $0.01/MWh between 13:45 and 14:00, reflecting the oversupply of renewable energy.
The price collapse was primarily driven by the combination of exceptionally high wind output and low system demand, which saturated the market with low-marginal-cost renewable energy. Binding constraints with marginal values of approximately $3.43–$3.44/MWh (constraint IDs F_T+RREG_0050 and F_TASCAP_RREG_0220) indicate network or operational limitations constraining the dispatch of additional generation or exports, forcing the region to absorb the surplus wind generation at near-zero prices rather than export or curtail efficiently.
Causal analysis generated by gridIQ's synthesis model from live AEMO market data: dispatch prices, generation mix, interconnector flows and market notices in the interval surrounding the event.